Metallic incandescent filament.



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UNITED STATES Parana) onirica. l

ANTON VLIEDERE1i., OF ATZGERSDORF, NEAR VIENNA. AUSTRIA-HUNGARY, ASSIGNCL'.

TO 'ESTINGHOUSE LAMP COMPANY, 0F LOOIYIFIELII, NEWJERSEY, A CORPORA- TION OF PENNSYLVANIA.

NIIE'IAILLICr INCANDESCENT FILAMENT In electric glow lamps" with metallic lilaments. in particular with tungsten v(ivob fram) hlaiiients (which burn with aneeo'ii- .omy of' 1 'att or even less per Hefner `candle. and require several filaments for higher voltagest electro-.stativ phenomena occur under certain eii'eiinistaiii-es. Such filaments become .shifted out ol' theirpliine,

and assume various-shapes. and oi'tenei'oss each otheralthough the direction of the current in the contiguous sections is reversed so as to have a rept-lling action. f

lt is found that filaments iii erossiiigofteii ass-unie the t'oi'in oll the figure 8 so that by this'nieaiis not ineoiisiderahle lengths are cnt out ot' circuit.. Asthe separate; filaments are almost withoiit. mais (a filament. of a4 filament lll) rolt 40 candle lamp has a diameter ot' 0.03 nini. and `a weight. of v0.002 grani) a slight and possible transientl occurrence of 'statieal electrical stress is siiflicient to bring it ont of its lane. The filament is thus shifted out of its plane may touch the adjacent fila-- nient; aportion 0f the filament is thus cut out of circuit. e I

The present invention relates to zin-improvedfform of and method of constructing metallic incandescence filaments for obviatinfr this disadvantage. V f

llt consists in giving `both legs of the i'ilanient a curvature, an outward curvature having in particular given good results.

The metal filaments can of course have the required form imparted to them before fixing in the glass globe but as the diameter of the entire incandescence structure' (consisting of several filaments arranged in a circle) is thereby increased, thus causing difliculties in mounting in the globe, it is of v f, Specition 0f Lewisham. Patented Sept'. 27, 1910;

Application filed Ang-ast 25,1906.' vSerial No. 332.077. Y

the globe is being exhausted ory whe the lamp is completer.. The filaments, when already fix/diran be. best shaped 1n the` glowing condition, and this can be effected in The object also attained byl imparting a l'apidrotation to the glowing lamp; also. by

advantage to im'part the requisite shape to tiie filzvimentsafter mounting, either whilerubbing the lamp globe preferably with a revolving felt-or leather ring, the globe. iis

chai-ged electro-statically and by this means the filaments are attracted andbrought'into the outwardly curved form. The following method is however tother preferred. The glow lamp is connected to the conductor of :in ewetrostatie niai'hi'iie orbthei' source of static electricity, the lamp being preferably surrounded by a inet-al ringk connected to the conductor. The opposite pole of the` machine is grounded. iVhen the metal ring is charged the filaments are attracted by or 'y repelled from the glas globe'. The lamp is then supplied with cui-rent` whereupon the filamentsl i'ieriiiaiieiitly assume an outwardly l or inwardly curved form, whichwvillV continue more or less eren after long use, the` outward bulge droppingr somewhat `lower after a time.V

ln the aeeompanying drawing, 'l' have illustrated a lamp embodying the features of the invention` 'lhe dotted lines S show 'the vsymmetrical disposition of the filaments,4

while the fiilllines indicated by S1 indicate the syii'm'ieti'ical positions into which they. have beenbronght by the means described in the specification.

ivhat I claim as my invention, and desire to secure b v Letters Patent is 1. In an incandescent electric lamp, a central support, a metallic filamenthaving loop shaped members arranged cyli; drically about the support, supportsl for tht ends of the loop-shaped members, anchors engaginv the bent port-ions of the members, the sai members bei-ng' bowed between the support- .ing ends and the anchors whereby the bent' portions are resiliently pressed Lagainst their respective anchors. Q

f2. In an candescent electric lamp having .metallic filaments, a central support about are resently presSedr'a-gnanst their respec- .A which the -iilaments are cylindrically arf tive anchors. 10 i Y ranged, the filaments being of loop shape,

In witness whereof Ihave hereunto set my leading-in wires to which the terminals of hand in presence of two witnesses.

5 the filaments are secured, anchors engagin the looped portions of the filaments, the sai filaments beinr bowed between the support- I Y ing ends and. ie anchors whereby the loops Witnesses:'

. Arvrsro S. Hocus,

, AUGUST FUGGER.

ANTON LEDERERL s 

